The Behaviour of Styrene Butadiene Rubber/Acrylonitrile Butadiene Rubber Blends in the Presence of Chlorinated Hydrocarbons

The behaviour of styrene butadiene rubber/acrylonitrile butadiene rubber (SBR/NBR) blends in the environment of chlorinated hydrocarbons, such as carbon tetrachloride, chloroform and dichloromethane, in the temperature range 32–52°C has been investigated. Sulphur, dicumyl peroxide and a mixed system consisting of sulphur and peroxide were used as the vulcanising systems for the matrix. The effects of vulcanising agents, blend composition, solvents and temperature on the sorption characteristics were studied. The sulphur-vulcanised systems exhibited the highest solvent uptake and those with dicumyl peroxide as the vulcanising agent the lowest. This difference has been explained on the basis of the nature of cross links established between the polymer chains during vulcanisation. The solvent uptake increased with an increase in SBR content in the blends when carbon tetrachloride was used as the penetrant, whilst it decreased with SBR content when chloroform and dichloromethane were used as the probes. This behaviour has been explained on the basis of the polarity difference of the solvents. For a given blend system, the solvent uptake was maximum when dichloromethane was used as the solvent and minimum when carbon tetrachloride was used. This has been accounted for in terms of the difference in the size of the penetrants. The intrinsic diffusion coefficient, permeation coefficient, cross link density and interaction parameter were estimated from the sorption data. Thermodynamic parameters such as enthalpy and free energy changes were also calculated. These values indicate that the sorption process in the present systems is exothermic and is more spontaneous in sulphur-vulcanised systems. The experimental results, when compared with different theoretical diffusion models, have been found to be closer to Robeson’s and Maxwell’s models.     

氢化丁腈橡胶／超细全硫化粉末丁腈橡胶共混物的结构与性能研究

采用熔融共混工艺制备了氢化丁腈橡胶（HNBR）／超细全硫化粉末丁腈橡胶（UFPNBR）共混物,研究了共混物相态结构、动态力学性能、力学性能及老化性能,并与HNBR／NBR共混物作了对比。透射电镜观察表明：在HNBR／UFPNBR体系中,HNBR容易形成连续相,UFPNBR为分散相;在HNBR／NBR体系中容易形成双连续相结构。DMA动态力学性能分析表明：2种共混物都只有一个tanδ峰,且相容性较好。HNBR／UFPNBR共混物在玻璃化转变区的tanδ峰值逐渐降低,而HNBR／NBR体系的tanδ峰值先减小后增大。加入适量的UFPNBR能降低HNBR／UFPNBR共混物的压缩永久变形;与常规共混胶相比,HNBR／UFPNBR具有低脆性温度和良好的耐老化性能,但力学性能略低。     

顺丁、丁腈橡胶离聚体改性聚氯乙烯研究

用马来酸酐接枝橡胶和金属离子交联形成离聚体的方法可提高顺丁橡胶(BR)、丁腈橡胶(NBR)、PVC三元共混物的相容性，以交联剂、引发剂、接枝单体为三要素，采用正交试验方法，通过综合评分法，优选了三元离聚体配方，在此基础上用部分硬脂酸锌代替无机氧化锌作离子交联剂，使合金材料获得了满意的性能，与未经改性PVC/BR/NBR三元共混物相比，硬脂酸锌离子交联马来酸酐接枝的三元合金的拉伸强度提高了101％，断裂伸长率增加113％，红外光谱证明了马来酸酐接枝顺丁胶与锌离子的离子交联的存在，且硬脂酸锌的效果优于氧化锌。     

Performances of a Polymeric Intumescent Flame Retardant in Styrene Butadiene Rubber

A polymeric intumescent flame retardant, PPVAM, was synthesized by the reaction of polyvinyl alcohol with phosphoric acid, and further with melamine. Flame-retardant properties of PPVAM in styrene butadiene rubber (SBR) were evaluated by using LOI and UL-94 test, and thermal decomposition and char of SBR/PPVAM composites were investigated by thermogravimetry, Muffle and SEM. The results indicate that SBR/PPVAM composites on burning can produce a multi-celluar char, resulting in good flame-retardant properties. The SBR/PPVAM composites after 70°C water treatment for 7 days still maintain good flame retardancy. Moreover, mechanical properties of SBR/PPVAM composites are studied.     

丁苯橡胶生产废水整改的必要性及工艺路线

论述了某化工厂丁苯橡胶生产废水的特性及对厂区污水处理场运行的影响;通过采用各种工艺技术对该废水进行小试并对水质数据比对,得出适合丁苯橡胶生产废水改造的工艺路线,使经预处理后的水质不会对污水处理场生化系统造成冲击。     

丁苯橡胶装置后处理凝聚系统优化改造

后处理系统是丁苯橡胶装置的最后一个生产单元,其运行状况的好坏直接决定着橡胶的品质及装置的运行周期。其中凝聚工序在整个后处理单元中占有重要地位,装置开工以来,通过对凝聚原理和工艺操作条件的摸索优化,找到最佳的凝聚条件、操作方法,从而达到提高产品质量,降低劳动强度,延长后处理运行周期的目的。     

丁苯橡胶聚合反应釜的制造技术

对丁苯橡胶装置聚合反应釜的制造难点进行了分析。对反应釜壳体的成形方法、复合钢板的焊接、封头与壳体的连接、冷却管组的成形与管束的分布形式等进行了深入的研究,解决了反应釜内件的组装难题,并对反应釜体内部进行了抛光。总结了聚合反应釜的制造经验,提高了产品质量和经济效益,可以为同类设备的制造提供参考。     

乳化剂造成丁苯橡胶乳液聚合反应下降原因分析

乳化剂在丁苯橡胶低温乳液生产过程中起到至关重要的作用,它是保证聚合反应平稳进行的重要因素之一,其组成体系的参数波动会对聚合反应结果造成较大的影响,使得聚合反应胶乳的TSC和门尼值发生波动,甚至造成生产事故。对由乳化剂pH值和TSC波动造成聚合反应下降的原因做了分析。     

苯乙烯-丁二烯橡胶(SBR)1502实验室间数据比对结果分析

《能力验证规则》CNAS-RL02:2007中明确规定,申请认可的实验室和已经通过认可的实验室要证明其在该领域具有的检验能力,参加能力验证、测量审核、与权威机构比对以及多家实验室间数据比对等系列质量活动是必经之路。在合成橡胶行业通过国家认可实验室较少,组织能力验证活动比较困难,为了满足合成橡胶行业有关生产企业及相关实验室的要求,国家合成橡胶质检中心牵头组织苯乙烯-丁二烯橡胶(SBR)1502产品全项分析实验室间数据比对。数据比对结果采用稳健统计技术进行了统计和分析,所有参加比对的实验室代表了该行业的测试水平。生胶门尼粘度、灰分、混炼胶门尼粘度和50 min 300%定伸应力等测试项目的测定结果较理想;挥发份、25 min 300%定伸应力、35 min 300%定伸应力、35 min拉伸强度和35 min扯断伸长率等测试项目出现的问题相对较多,均有两个以上实验室出现可疑值或离群值;部分实验室尚缺乏化学分析测试能力,应加强相关内容的培训,补充实验仪器的配置,积极参与实验室间比对,不断提高实验室化学分析测试水平。     

Comparison of Properties of Polypropylene (PP)/Virgin Acrylonitrile Butadiene Rubber (NBRv) and Polypropylene (PP)/Recycled Acrylonitrile Butadiene Rubber (NBRr) Blends

The comparison properties of polypropylene (PP)/recycled acrylonitrile butadiene rubber (NBRr) blends and polypropylene/virgin acrylonitrile butadiene rubber (NBRv) blends were investigated. The tensile properties such as tensile strength, tensile modulus and elongation at break of PP/NBRv blends are higher than PP/NBRr blends. However, PP/NBRv blends exhibit lower stabilization torque and higher swelling percentage than PP/NBRr blends. Based on SEM, a finer morphology was observed in PP/NBRv blends in comparison with the PP/NBRr blends. The thermal stability of PP/NBRr is better than that of PP/NBRv blends.     

丁腈橡胶对白炭黑炭黑补强溶聚丁苯橡胶性能的影响

研究丁腈橡胶（NBR）用量对白炭黑-炭黑补强溶聚丁苯橡胶（SSBR）性能的影响。结果表明：随着NBR用量的增大,白炭黑-炭黑补强SSBR混炼胶的t10和t90缩短,硫化速度提高;硫化胶的拉伸强度略有下降,压缩生热和压缩永久变形增大;NBR用量为4份时可以同时优化胶料的抗湿滑性能、滚动阻力和耐磨性能。     

Natural Weathering Test of Styrene Butadiene Rubber and Recycled Acrylonitrile Butadiene Rubber (SBR/NBRr) Blends

The effect of recycled acrylonitrile butadiene rubber (NBRr) content of SBR/NBRr blends on natural weathering was studied. Three different size of NBRr (S1; 117–334 µm, S2; 0.85–15.0 mm and S3; direct sheeted form) were used and the blends were exposed to natural weathering for 3 and 6 months. The results indicated that the SBR/NBRr blends with smallest size of NBRr (S1) show a better retention of tensile properties, which are able to withstand better weathering than coarser size (S2 and S3) of SBR/NBRr blends. The presence of hydroxyl, carbonyl and nitro group after exposure to natural weathering was detected in FTIR analysis, which related to the UV oxidation process of rubber blends. The scanning electron microscopy proved that the SBR/NBRr blends with smallest size of NBRr (S1) with higher content of NBRr, shows a better resistant to natural weathering.     

丁苯橡胶市场分析及生产技术进展

阐述了国内外丁苯橡胶(SBR)生产商的生产能力和实际产量、对国内SBR技术现状及其市场发展趋势进行了分析和预测。介绍了国内外科研开发、技术进展以及新产品开发情况,并针对国内SBR装置提出了几点建议。     

白炭黑品种及用量对SSBR/BR并用胶性能的影响

研究了白炭黑比表面积及用量对SSBR/BR并用胶性能的影响。结果表明,随着白炭黑用量的增大,所选3种白炭黑填充的胶料正硫化时间均有不同程度的延长;比表面积较大的白炭黑Z1165MP和白炭黑175GR对胶料焦烧时间的影响较大;白炭黑用量少于70份时,随着白炭黑比表面积的增大,硫化胶拉伸强度和撕裂强度均明显增大,硬度和生热量同时升高,回弹性降低。混炼胶和硫化胶的Payne效应及60℃损耗因子均随3种白炭黑的用量和比表面积的增大而增大。     

聚酰亚胺/有机蒙脱土/丁苯橡胶复合材料性能的研究

将聚酰亚胺(PI)与有机蒙脱土(OMMT)混合,制备了PI/OMMT粉状材料;将粉状材料与丁苯胶乳(SBR)混合,制备了颗粒状PI/OMMT/SBR复合材料.SEM照片显示,有机蒙脱土可改善聚酰亚胺与丁苯橡胶的相容性.X射线衍射(XRD)结果表明,聚酰亚胺分子链与丁苯橡胶分子链一起插入有机蒙脱土层间,使层间距变大;有机蒙脱土作为交联点存在.动态力学性能测试结果表明,在频率扫描下,加入PI/OMMT后丁苯橡胶的G′最高,但tanδ较低.     

超细丁苯粉末橡胶增韧聚丙烯的研究

采用一种新型超细丁苯粉末橡胶作为增韧剂,提高聚丙烯（PP）韧性,考察了粉末橡胶的含量、相客剂的种类和用量对PP性能的影响。利用TEM和SEM考察了改性PP中粉末橡胶的分散状态,同时采用DSC研究了粉末橡胶对PP结晶性能的影响。     

环保芳烃油对溶聚丁苯橡胶工艺性能的影响

研究几种环保芳烃油（TDAE）对溶聚丁苯橡胶（SSBR）工艺性能的影响,并与芳烃油（DAE）进行对比。试验结果表明：以TDAE替代DAE,随着油品运动粘度或芳烃含量的增大,SSBR生胶及混炼胶的门尼粘度先减小后增大;胶料的门尼焦烧时间延长,硫化速度减慢,t90随油品芳烃含量的减小而逐渐延长,自粘性较好,出口膨胀率减小;硫化胶的物理性能无明显差异。     

自动化立体仓库在丁苯橡胶工程中的应用

自动化立体仓库具有占地面积小、空间利用率高、效率高,机械化和自动化程度高,可达到无人操作,特别是仓库管理电算化这一优势对橡胶生产尤其重要.以某工程设计实例为基础,介绍了自动化立体仓库在成品丁苯橡胶的仓库贮存工序中的首次应用.     

Mechanical,Water-Swelling,and Morphological Properties of Water-Swellable Thermoplastic Vulcanizates Based on High Density Polyethylene/Chlorinated Polyethylene/Nitrile Butadiene Rubber/Cross-Linked Sodium Polyacrylate Blends

A novel water-swellable rubber (WSR) had been prepared by dynamically vulcanized high density polyethylene (HDPE)/chlorinated polyethylene (CPE)/nitrile butadiene rubber (NBR) blends where a cross-linked poly(sodium acrylate) (CPNaAA) was used as a super water-absorbent resin. The mechanical, water-swelling and morphological properties of the WSRs were investigated. Increasing CPNaAA dosages, mechanical properties of WSRs decreased while water-swelling ratio were increased significantly; moreover, swelling ratio of WSRs with 70 phr CPNaAA was reached 956.7% at 55 h. Morphological studies showed that CPNaAA were dispersed randomly in the TPVs, and significant gaps could be found in the surface of dried WSRs.     

不同防护体系的星形溶聚丁苯橡胶耐老化性能研究

研究3种防老剂对星形溶聚丁苯橡胶(SSBR)耐老化性能的影响.结果表明:在SSBR中加入少量防老剂即可获得良好的热氧稳定性;采用防老剂X或Z的SSBR热氧稳定性较好;防老剂X在SSBR中的应用效果较好,其适宜用量为0.4份.